Adjective
inphase (comparative more inphase, superlative most inphase)
Alternative form of in phase
In QAM, an inphase signal (or I, with one example being a cosine waveform) and a quadrature phase signal (or Q, with an example being a sine wave) are amplitude modulated with a finite number of amplitudes, and then summed. Source: Internet
The equivalent baseband signal is where is the inphase signal, the quadrature phase signal, and the imaginary unit. Source: Internet